Julien Le Dem
@julien.ledem.net
Principal Engineer, Founder, Angel, Advisor, OSS. LFAI&data: OpenLineage, Marquez, ASF: Parquet, Arrow, Iceberg, 🐖 he/him. Me: https://julien.ledem.net/ Blog: https://sympathetic.ink
I had a great time seating with Whitney Lee to chat about OpenLineage Datadog Illuminated is such a fun format! www.youtube.com/watch?v=uIuB...
OpenLineage - A Common Observability Framework for Data Pipelines
YouTube video by Datadog Community
youtube.com
The recording of the talk "The Deconstructed Database at Datadog" that Pierre Lacave and I gave at AI Council this year now available. www.youtube.com/watch?v=Bh9O...
The Deconstructed Database at Datadog
YouTube video by AI Council
youtube.com
If you missed my talk "Column storage for the AI era", this is your chance to watch it live tomorrow in SF. thedive.motherduck.com#schedule
The Dive — MotherDuck at Snowflake Summit 2026
Your home base during Snowflake Summit.
thedive.motherduck.com
The recording of my Iceberg Summit keynote "Column Storage for the AI Era" is now available. www.youtube.com/watch?v=qWU3...
youtube.com
Recording of the Seattle Parquet meetup. Thank you Xinli, Micah, Kenny and all the presenters. www.youtube.com/watch?v=69nT...
Seattle Apache Parquet Meetup May 2026
YouTube video by Xinli shang
youtube.com
Last year, I gave a keynote at AI Council about The Deconstructed Database: a composable and extensible database design enabled by the cloud and a collection of standard open source formats and components. (Parquet, Arrow, Substrait, Iceberg, OpenLineage, Calcite, DataFusion).
Thank you for letting me keynote day 2 of the Iceberg summit. I hope you all enjoyed it!
And that’s a wrap! Thank you for a great Iceberg Summit! @thedanicafine.bsky.social, Matt and everyone involved in the organization.
If you want to learn more about the Variant type in Parquet, Aihua Xu and @andrewlamb1111.bsky.social wrote a great blog post on the project blog. parquet.apache.org/blog/2026/02...
Variant Type in Apache Parquet for Semi-Structured Data
Introducing Native Variant Type in Apache Parquet
parquet.apache.org
Great inaugural post about the geospatial types on the Parquet blog. Thank you Jia Yu, Dewey Dunnington , Kristin Cowalcijk, Feng Zhang. More posts coming ! parquet.apache.org/blog/2026/02...
Native Geospatial Types in Apache Parquet
Native Geospatial Types in Apache Parquet
parquet.apache.org
Apache Arrow is ten years old! I can't believe that Apache board meeting when the project was instated was 10 years ago! This went fast! arrow.apache.org/blog/2026/02...
Apache Arrow is 10 years old 🎉
The Apache Arrow project was officially established and had its first git commit on February 5th 2016, and we are therefore enthusiastic to announce its 10-year anniversary! Looking back over these 10...
arrow.apache.org
Congratulations to @andrewlamb1111.bsky.social on becoming the latest Parquet PMC member! Thank you, Andrew, for your leadership in the community. I look forward to our continued collaboration!
File formats! Great references 😎
Andy Pavlo@andypavlo.bsky.social · 7mo agoI've posted my latest recap of the world of databases: www.cs.cmu.edu/~pavlo/blog/... All the hot topics from the last year: • More Postgres action! • MCP for everyone! • MongoDB gets litigious with FerretDB! • File formats! • Market movements! • The richest person in the history of the world!
And that applies to sparkling wine as well ;)
WIRED@wired.com · 7mo agoDon't just party on New Year's Eve, think about the cool physics that you can see around you.
I always dip the fries in the tartar sauce with my fish and chips.
doggsul@doggsul.bsky.social · 7mo agoketchup isn’t available, what are you putting on your fries?
In the past few years, we’ve seen a cambrian explosion of new columnar formats, challenging the hegemony of Parquet. Presumably, the design of yore is not going to cut it moving forward. I spent some time to understand a bit better how things actually changed. sympathetic.ink/2025/12/11/C...
Column Storage for the AI Era
In the past few years, we’ve seen a cambrian explosion of new columnar formats, challenging the hegemony of Parquet: Lance, Fastlanes, Nimble, Vortex, AnyBlox, F3 (File Format for the Future). The thi...
sympathetic.ink
If you missed my talk "The advent of the open data lake" at AI By the Bay, the recording is now available. ai.bythebay.io/talks/the-ad... www.youtube.com/watch?v=xHGV...
The advent of the open data lake | Julien Le Dem, AI By the Bay 2025
YouTube video by FunctionalTV
youtube.com
It turns out that Friday’s NYT’s mini crosswords was written by my 13-year-old.
Parquet praise in the wild :) Nice chatting with you at Datacouncil Hannes! www.youtube.com/watch?v=zeon...
Introducing DuckLake
YouTube video by DuckDB
youtube.com